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  • Buna-N O-Ring Kit, 70A Durometer, 382 Pieces, 30 Sizes
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Buna-N O-Ring Kit, 70A Durometer, 382 Pieces, 30 Sizes

58 customer reviews
| 8 answered questions

Price: $22.12 & FREE Shipping on orders over $35. Details
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Ships from and sold by Amazon.com.

Specifications for this item
Brand Name Small Parts
Part Number 650KIT70P
Material Type Nitrile Rubber
Hardness 70A
System of Measurement Inch
Color Black
Cross Section Shape Round
LowerTemperature Range -30  Degrees Fahrenheit
Upper Temperature Range 250  Degrees Fahrenheit
Specification Met AS568A
Durometer 70A
Number of Items 382
UNSPSC Code 31410000

This O-Ring set is made of Black Buna-N, has a durometer of 70A, and includes 382 pieces cover... Read full product description



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Product Features

  • Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids from petroleum to aliphatic hydrocarbons and has a durometer (hardness) of 70A for resistance to penetration
  • Includes 382 pieces for covering 30 dash sizes
  • For use across a wide temperature range from -30 degrees F/-34 degrees C to 250 degrees F/121 degrees C
  • Meets Aerospace Standard AS568A for quality assurance
  • Plastic case for portability and organized storage

Product Details

  • Shipping Weight: 1.6 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B005LRSAT0
  • Item model number: 650KIT70P
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (58 customer reviews)
  • Amazon Best Sellers Rank: #3,806 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Frequently Bought Together

Buna-N O-Ring Kit, 70A Durometer, 382 Pieces, 30 Sizes + Wilmar W5203 Metric O-Ring Assortment, 419-Piece + Neiko Tools 407-Piece Rubber O-Ring Assortment Kit - 32 SAE Sizes
Price for all three: $51.71

Buy the selected items together

Product Description

This O-Ring set is made of Black Buna-N, has a durometer of 70A, and includes 382 pieces covering 30 dash sizes. The rings have a Round cross-section and can be used across a wide temperature range from -40 degrees F (-40 degrees C) to 212 degrees F (100 degrees C). The rings come in a plastic storage case designed for organization and portability. Designed for use in a variety of sealing applications, this Buna-N O-Ring set meets standards defined by Aerospace Standard AS568A for quality assurance.

The set includes the following O-Rings: 20 pieces each for dash sizes 006, 007, 008, 009, 010, 011, and 012; 13 pieces each for dash sizes 110, 111, 112, 113, 114, 115, and 116; 10 pieces each for dash sizes 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, and 222; 7 pieces each for dash sizes 325, 326, and 327.

Buna-nitrile can have high tensile strength, as well as abrasion, tear, and compression set resistance. It is compatible for use with petroleum, hexafluoroacetone (HFA), hexafluoro-2-butyne (HFB) and hydrofluorocarbon (HFC) fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering, and should not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.

The durometer hardness of this Buna-N O-Ring is 70A. Durometers measure the hardness of a material and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation. On a scale of 0 to 100, a value of 0 indicates that a sample was completely penetrated, while a value of 100 shows no indentation in the sample. The letter following the number identifies the shore scale, which is either shore A or D. Shore A is used for rubber, while shore D is used for harder plastics.

O-rings provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross section, and a hole in the center, similar to a doughnut. O-rings are available in various AS568A dash sizes as well as Metric sizes. O-ring size is defined by the inside diameter (ID), outisde diameter (OD), and cross-sectional (CS) diameter.

What's in the box?

  • 20 pieces each for dash sizes 006, 007, 008, 009, 010, 011, and 012
  • 13 pieces each for dash sizes 110, 111, 112, 113, 114, 115, and 116
  • 10 pieces each for dash sizes 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, and 222
  • 7 pieces each for dash sizes 325, 326, and 327
  • plastic storage case with label to identify sizes

  • Customer Questions & Answers

    Customer Reviews

    Most Helpful Customer Reviews

    44 of 45 people found the following review helpful By Freakonforfatty TOP 1000 REVIEWER on September 12, 2012
    Verified Purchase
    This kit has a great assortment of O-rings of different Dash. I need one for a leaking faucet in my kitchen, but soon found out the old o-ring I was replacing was thiner than the one I got out of this set. I know it's my fault for not measuring the old one's thickness, but I wish this kit would have more info about each piece's thickness.

    Anyway, I ended up using the o-ring anyway, because I didn't have the time to be looking for the right one anymore, the faucet head won't go in all the way into its base, but it's not leaking anymore . Point is, I will give you the thickness of each ring provided in this kit. I used a caliper and measured each by inch fractions, if you need me to do mm or whole inches, please let me know. I will list the Dash numbers and since most are the same thickness, I will simply place a - between size ranges.

    Between Dash number 325 - 327 the thickness is 13/64 of an inch.

    Between Dash number 210 - 222 the thickness is 9/64 of an inch

    Between Dash number 110 - 116 the thickness is 3/32 of an inch

    Between Dash number 006 - 012 the thickness is 1/16 of an inch.`

    Well, that's it for the thickness. As I said, the kit is great for an assortment of diameters, but it may not be that great for those looking for thinner o-rings. I hope this helps.
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    19 of 21 people found the following review helpful By Thetaguy on April 11, 2012
    I have this kit and it has been useful to have around the garage. Running to the hardware store for a single o-ring is silly. I have used the kit to rebuild my hydraulic floor jack and to construct a power bleeder kit for automotive brake systems.

    Note: the Amazon price is okay, but this same kit is usually available at the local HF store for one-third the price.
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    14 of 15 people found the following review helpful By oldhotrodder2 on May 13, 2012
    Verified Purchase
    This assortment was on Gold Box for a good price, that said, it is a valuable assortment to have on hand. I thought it would sit on the shelf for a time until I actually used it. It was only 1 week until I was repairing a neighbors lawn mower and needed a gasket for the fuel bowl. Well, not having a gasket, I looked in the O ring box. TADA ! Just the right size. Saved the day and now I don't have to look at tall grass !
    And, by the way, one of the o rings fits DELTA single handle faucets also.
    A nice selection of sizes and quantity. For under $10.00, well worth having sit on the garage shelf !
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    7 of 8 people found the following review helpful By LarryA on September 4, 2012
    Verified Purchase
    When it comes to "O" ring gaskets, my tastes are very discerning. My needs were satisfied, and then some, with this fine product. My highest marks.
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    1 of 1 people found the following review helpful By Js VINE VOICE on May 23, 2013
    Verified Purchase
    I only need an o ring once in a blue moon. A ton of sizes are conveniently and securely organized in a compact box that stays out of my way till I need it. Great price, too.

    Update: I have needed o rings from this box three times already, and my neighbor is dipping in to the supply also; lots to go around.
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    3 of 4 people found the following review helpful By Dave on October 9, 2012
    Verified Purchase
    good quality o rings, and good selection of sizes.
    already came in very handy in shop fixing and tuning my airguns
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    Verified Purchase
    Another perfect set for your shop at home. As cheap as these are, you should keep in your shop or garage for when you need a replacement. You can never find the right size when you need one. Undoubtedly it will be Sunday night with guests over at the house. These are good quality and the set is better than any I've had before. The box actually holds and keeps them separate. I'm not used to that! Highly recommended.
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    2 of 3 people found the following review helpful By occasionallyawesomereviews on January 4, 2013
    Verified Purchase
    Amazing kit, that any DIYer should have. It will save you numerous trips to the hardware store and will allow you to give tighter seals to whatever your working on.

    Must have, great Quality! My only complaint is that the o-rings get lose in the case and some are difficult to differentiate, other than that great product.
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